Gemstone



FIG. 1 is a first side view of a gemstone showing my new design;

FIG. 2 is a second side view thereof;

FIG. 3 is a third side view thereof;

FIG. 4 is a fourth side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines shown in the drawings depict unclaimed portions of the gemstone and form no part of the claimed design. 

CLAIM The ornamental design for a gemstone, as shown and described. 